linux-kernel - Re: [PATCH] nvmem: core: fix the return value check when calling the notifier chain

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Date:   Fri, 15 Feb 2019 11:43:35 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] nvmem: core: fix the return value check when calling the
 notifier chain

pt., 15 lut 2019 o 11:26 Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> napisał(a):
>
>
>
> On 15/02/2019 09:41, Bartosz Golaszewski wrote:
> >> rval will be masked with STOP MASK, so the above statement could be
> >> false even if we have error.
> >> So you should consider returning an errono which can be understood by user:
> >>
> >> may be something like this:
> >>
> >> if (rval & NOTIFY_STOP_MASK) {
> >>          rval = notifier_to_errno(rval);
> >>          goto err_remove_cells
> >> }
> >>
> > Actually I'm now thinking we can remove this check at all - most users
> > never check the return values of notifier chain calls. This function
> > cannot fail in itself. What do you think?
> Thats even better, I was about to suggest the same on the fact that we
> should allow nvmem provider to register to be successful irrespective of
> the notifier callback failures.
>
> --srini

Right, I sent a different patch.

Bart